1. Right click on your the "Files" folder of your project
2. Select "New" - "Array"
3. Fill in your data and close the array editor
4. Go to your layout and add the Array object and AJAX object
5. Add an "System - on start of layout" event and give add the action "AJAX - Request project file" to it , selecting your "New Array.json" the tag "array"
6. Add an "AJAX - on completed" event with the "array" tag and add the action "Array - load" to it, giving the expression "AJAX.LastData"
That should do the job! At the moment there's a bug with the data editor / text editor where they don't sync with the project unless you save the project or close the data editor / text editor which might cause you some confusion.